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How is SOC or range calculated?

Discussion in 'Roadster: Technical' started by spaceballs, Aug 29, 2014.

  1. spaceballs

    spaceballs Member

    Joined:
    Sep 17, 2013
    Messages:
    585
    Location:
    Sammamish
    Does anyone know how SOC or range is calculated on the Roadster? My fake sheet (bricks 46-54) has confused the roadster to drop it's range to 17 miles.

    Voltage SOC Brick
    3.91 84.11 1
    3.89 82.27 2
    3.91 85.15 3
    3.93 89.25 4
    3.93 90.02 5
    3.94 90.74 6
    3.94 91.23 7
    3.94 91.53 8
    3.95 92.47 9
    3.90 83.08 10
    3.89 81.28 11
    3.90 84.30 12
    3.92 88.24 13
    3.93 89.77 14
    3.94 90.23 15
    3.94 90.73 16
    3.94 91.54 17
    3.95 91.98 18
    3.90 84.30 19
    3.89 81.28 20
    3.91 85.15 21
    3.93 89.25 22
    3.93 89.77 23
    3.94 90.74 24
    3.94 90.73 25
    3.94 91.52 26
    3.95 92.19 27
    3.90 84.11 28
    3.89 82.27 29
    3.90 84.11 30
    3.93 89.25 31
    3.94 90.55 32
    3.94 90.84 33
    3.94 91.53 34
    3.94 91.76 35
    3.95 92.76 36
    3.90 83.90 37
    3.90 83.30 38
    3.91 85.15 39
    3.93 89.25 40
    3.93 89.84 41
    3.94 90.55 42
    3.94 91.23 43
    3.94 91.77 44
    3.95 92.48 45
    3.82 30.74 46
    3.81 22.61 47
    3.75 28.75 48
    3.82 28.83 49
    3.74 25.58 50
    3.80 45.06 51
    3.77 47.77 52
    3.78 51.28 53
    3.81 66.87 54
    3.90 84.11 55
    3.90 83.30 56
    3.91 85.15 57
    3.93 89.25 58
    3.93 90.23 59
    3.94 90.73 60
    3.94 91.23 61
    3.94 91.53 62
    3.95 92.47 63
    3.89 82.27 64
    3.89 80.33 65
    3.90 83.08 66
    3.92 88.24 67
    3.93 89.76 68
    3.93 90.23 69
    3.94 90.51 70
    3.94 91.23 71
    3.94 91.76 72
    3.90 84.11 73
    3.90 84.30 74
    3.92 87.23 75
    3.93 89.25 76
    3.94 90.23 77
    3.94 90.84 78
    3.94 91.54 79
    3.95 92.47 80
    3.95 92.98 81
    3.91 84.11 82
    3.90 82.27 83
    3.91 85.15 84
    3.93 89.03 85
    3.94 90.55 86
    3.94 90.84 87
    3.94 91.23 88
    3.94 91.77 89
    3.95 92.47 90
    3.91 86.20 91
    3.90 84.11 92
    3.92 87.23 93
    3.93 89.80 94
    3.94 90.55 95
    3.94 91.23 96
    3.94 91.56 97
    3.94 91.77 98
    3.95 92.49 99
     
  2. marco2228

    marco2228 Roadster Signature #34

    Joined:
    Nov 19, 2010
    Messages:
    203
    Location:
    Cologne/Bremen , Germany
    17 miles in standard or range; ideal or rated?

    Standard could make sense. Range has to be calculated from the brick with the lowest amount of left energy.

    This is what I believe:
    SOC range in standard mode: 10 - 100 % SOC (not sure about the 10%)
    SOC range in range mode: 0 - 110 % SOC

    Your lowest brick has a SOC of 22% which is 12 % in standard mode.
    That would be 141 miles (rated?) for 100 % SOC.

    - - - Updated - - -

    That's strange. Brick #47 has a higher voltage but lower SOC...

    So the SOC seems not to be calculated from the voltage only.
     
  3. spaceballs

    spaceballs Member

    Joined:
    Sep 17, 2013
    Messages:
    585
    Location:
    Sammamish
    Thanks Marco.

    It was in standard mode.

    Before the mileage drop, I said I had 144 mile range, I think I need to do more playing on the fake sheet and gather more data.
     
  4. spaceballs

    spaceballs Member

    Joined:
    Sep 17, 2013
    Messages:
    585
    Location:
    Sammamish
    #4 spaceballs, Aug 29, 2014
    Last edited: Aug 30, 2014
    I noticed the lowest brick as I bring up the voltage on it, that range start to rise, seem like a direct correlation but I assume some SOC is factored in it.

    Sigh, I accidentally burnt out resistor R73 on the dc-dc converter... hopefully this will be an easy fix.

    Edit: BMB fixed, in case anyone cares, R73 is likely a current limiting resistor to the DC-DC converter, so if the DC-DC converter ever goes bad R73 will burn out.
     

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